Gross Areas Standard

Published in 2009, the Gross Areas Standard is the industry’s first direct measure of the physical size of a building. Gross Areas of a Building: Standard Methods of Measurement (ANSI/BOMA Z65.3—2009) details procedures for measuring construction gross area and exterior gross area of buildings. Both methods can be applied to new and existing buildings, single or multiple stories, owner-occupied or leased, and for all types of occupancies and uses. The construction gross area includes the area defined as exterior gross area as well as other areas that have a structural floor, or are covered by a roof or canopy, that are typically unenclosed but within the building perimeter. The exterior gross area is the total floor area contained within the measure line—generally the outside surface of the exterior enclosure of building—including structured parking.

Features of the Gross Areas Standard include:

  • Application to all building types—office, industrial, retail, single and multi-unit residential, hospitality, entertainment, and public and private institutional buildings.
  • Applies to both new and existing buildings.
  • 31 definitions used in calculating gross areas.
  • 37 illustrations to graphically support the measurement concepts and conditions.